CN201860492U - Light modulating device for LED illumination lamp - Google Patents

Abstract

The utility model relates to a light modulating device for the LED illumination lamp, which comprises a control system, a brightness modulating module, and a light brightness induction module for measuring the environmental brightness. The signal output end of the light brightness induction module is connected with the signal input end of the control system. The brightness modulation module is a pulse width modulation circuit, the control signal output end of the control system is connected with the control signal input end of the pulse width modulation circuit, and the output end of the pulse width modulation circuit is connected with the input end of the constant circuit control chip of the LED. The utility model is capable of automatically modulating the brightness of the LED illumination lamp according to the environmental brightness.

Description

LED lighting dimming device

technical field

The utility model relates to an LED lighting lamp, in particular to a dimming device for the LED lighting lamp.

Background technique

The lighting system is an essential part of every family, but the current lighting power and brightness are fixed, which is far from meeting the needs of modern people in pursuit of a comfortable life, and the lighting brightness is not combined with the natural light brightness, which will cause power loss.

Utility model content

The technical problem to be solved by the utility model is to provide a dimming device for an LED lighting lamp, which can automatically adjust the brightness of the LED lighting lamp according to the brightness of the environment.

The technical solution adopted by the utility model to solve the problems of the technologies described above is:

LED lighting dimming device, which includes a control system, a brightness adjustment module and a light intensity sensing module for measuring ambient brightness; the signal output end of the light intensity sensing module is connected to the signal input end of the control system;

The brightness adjustment module is a pulse width modulation circuit, the output end of the control signal (PWM signal) of the control system is connected to the control signal input end of the pulse width modulation circuit, the output end of the pulse width modulation circuit is connected to the input end of the constant current control chip of the LED connect.

In the solution above, the control system includes a wireless receiving module for setting parameters of the control system.

The working principle of the utility model is: the control system collects the signal of the light intensity detection module, and outputs PWM signals with different duty ratios to control the output power of the pulse width modulation circuit, thereby controlling the brightness of the LED lighting lamp.

The utility model can close-loop compensate the brightness of the lighting lamp according to the brightness of the environment, so that the environment can be maintained at a constant brightness, and the brightness of the environment can be set according to the different requirements for brightness of different activity places, so that it is in an ideal condition and saves electric energy at the same time. Comfortable life.

Description of drawings

Fig. 1 is a functional block diagram of an intelligent energy-saving power distribution system for a home office environment according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of the structure of the embodiment of the utility model.

Figure 3 is an electrical schematic diagram of the control system.

Figure 4 is a schematic diagram of the wireless receiving module circuit.

Fig. 5 is a circuit schematic diagram of the DC power supply and brightness adjustment module.

Figure 6 is a flow chart of the control system.

Figure 7 is the PID control model.

Detailed ways

As shown in Figure 1, the intelligent energy-saving power distribution system for home office environment includes: distribution box part, smart socket, automatic dimming part, and remote control part. The automatic dimming part includes the LED lighting dimming device of the utility model.

The utility model embodiment as shown in Figure 2, it comprises control system, brightness adjustment module and the light intensity sensing module that is used to measure ambient brightness; The signal output end of light intensity sensing module is connected with the signal input end of control system;

The brightness adjustment module is a pulse width modulation circuit, the control signal output end of the control system is connected to the control signal input end of the pulse width modulation circuit, and the output end of the pulse width modulation circuit is connected to the input end of the constant current control chip of the LED.

The embodiment of the utility model and the LED lighting lamp are powered by an AC-DC conversion circuit after converting the commercial power into DC power.

The control system includes a wireless receiving module for setting parameters of the control system. The wireless receiving module is shown in Figure 4, and the control system sets parameters through the wireless receiving module.

As shown in Figure 3, the MCU control system changes the duty cycle of the PWM output by the MCU by collecting light intensity detection modules and receiving wireless signals, thereby controlling the output power of the dimming module; the AC-DC conversion circuit uses AC filtering, rectification, power The rectified DC pulsating voltage is supplied to the LED lighting, and then the DC power supply 12V (supplied to the LED constant current control chip) and 3.3V (supplied to the system microcontroller) are respectively obtained through resistor voltage division and voltage regulator tube stabilization; in the light intensity sensing circuit, The light intensity detection uses a photosensitive sensor to detect the light intensity signal, and transmits the signal to the single-chip microcomputer; the single-chip microcomputer changes the output power of the constant current control chip driving the LED in the brightness adjustment circuit by controlling the PWM duty cycle of its own output, and controls the LED lamp. Brightness; the wireless receiving circuit adopts the super-regenerative receiving circuit corresponding to the transmitting circuit to receive the control signal of the remote controller, thereby adjusting the scene of the lighting lamp.

As shown in Figure 5, CX1, CX2, and LC1 in the circuit are typical AC filter circuits, which can prevent the high-frequency components in the power grid from affecting the designed circuit and suppress common-mode interference. After the AC is rectified by D1, D2, D3, and D4 Get high-voltage DC pulsating power, CE1, CE2, D5, D6, D7, RP1, RP2, RP3 form a PFC power correction filter circuit, where a current-by-flow circuit is used—series charging and parallel discharging, which can greatly improve the power factor of the system. Then after filtering by C1, a relatively stable DC voltage is obtained to supply power to the LED. After the DC voltage passes through R1, R2, R3, and R4, it can be stabilized by a voltage regulator tube to obtain the 12V voltage required by BP2808, and then divided by a large resistor. Afterwards, the stable voltage of 3.3V is sent to the single-chip microcomputer through the voltage regulator chip.

The brightness adjustment module is a key part of the lighting dimming part, and it is also a difficult point of design. The chip system has an application voltage range from 12V to 600V DC voltage input, supports AC 85V-265V input, and can adjust the duty cycle from 0-100%. Up to 93% system efficiency, multiplexed DIM pins for LED analog dimming, PWM dimming and system dynamic temperature compensation, PWM dimming is to change the brightness of the lamp by changing the duty cycle of PWM at the BP2808 DIM input. In order to achieve high-contrast and high-precision control of LED lights, this design uses PWM dimming technology to control the brightness of LED lights. The larger the duty cycle, the brighter the LED light.

The idea of the control system program is as follows:

1. Through the remote control setting, the current required illuminance value is stored in the single-chip microcomputer, and the single-chip microcomputer regularly samples the sensing information and compares it with the standard value in the single-chip microcomputer to change the PWM duty cycle, and automatically compensates the lighting lamp to keep the indoor brightness constant.

2. On the basis of automatic dimming, the indoor illuminance can be adjusted to 100%, 75%, 50% and 25% of the standard illuminance. When receiving different wireless signals, the microcontroller adjusts the PWM duty cycle output to correspond to the illuminance. After restarting after a power failure, the illumination value of the lamp is 100%.

3. It is not necessary to set so many modes for every street light. According to the national illumination standard GB50034-2004, the scene setting of the dimming part (lighting dimming part) is as follows, and the unit behind the number is the illuminance unit LUX.

Living room: general activities (75) receiving guests (150) reading newspapers (300)

Bedroom: general activities (75) bedside reading (150)

Kitchen: General Activities (100) Cooking (150)

Office: general office (200) high-end office (500) meeting (300)

According to the above algorithm, the flow chart is obtained as shown in Figure 6.

Since the ambient illumination is not constant and is constantly changing, we use the software PID closed-loop control algorithm and cooperate with the hardware circuit to make the system brightness more stable. The basic model of PID control is shown in Figure 7.

Claims (2)

1. The dimming device for LED lighting lamps is characterized in that: it includes a control system, a brightness adjustment module and a light intensity sensing module for measuring ambient brightness; the signal output end of the light intensity sensing module is connected to the signal input end of the control system; The brightness adjustment module is a pulse width modulation circuit, the control signal output end of the control system is connected to the control signal input end of the pulse width modulation circuit, and the output end of the pulse width modulation circuit is connected to the input end of the constant current control chip of the LED. 2. The LED lighting dimming device according to claim 1, wherein the control system includes a wireless receiving module for controlling system setting parameters.

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